Method, device and system for paging signaling in wireless network

Abstract

The present disclosure describes a method and system for UE monitoring paging DCI. Paging DCI includes several different types. UEs are divided into multiple groups. Each UE group can monitor any combination of several types of paging DCI. The type of paging DCI is determined by a predefined feature. The paging frame and paging occasion associated with each type of paging DCI for a specific UE can be determined based on a UE identifier. The scheme described in the present disclosure helps to reduce the false alarm rate in paging monitoring, thereby reducing the UE power consumption of the UE, especially the UE in the RRC idle state or the RRC inactive state.

Description

Technical Field

[0001] The present disclosure relates generally to wireless communications and, more particularly, to methods, devices, and systems for various types of paging signaling. Background Art

[0002] Reducing the power consumption of mobile devices and increasing the battery life have always been important goals when designing wireless communication networks and mobile devices. Efficient signaling between wireless communication networks and mobile devices can greatly contribute to such power saving. Summary of the invention

[0003] The present disclosure relates to methods, devices, and systems for various types of paging signaling in wireless communications.

[0004] In some embodiments, a method performed by a wireless terminal in a wireless network is disclosed. The method may include: determining one or more paging occasions (PO) within a predetermined duration, each paging occasion for one of one or more types of paging DCI, wherein the paging occasion of at least one of the one or more types of paging DCI is based on at least a truncated identifier of the wireless terminal and a group identifier of the wireless terminal; and monitoring a physical downlink control channel (PDCCH) at one or more POs within the predetermined duration. The one or more types of paging DCI include at least one of a first type, a second type, or a third type of paging DCI.

[0005] A wireless terminal is also disclosed. The wireless terminal includes a processor and a memory, wherein the processor is configured to read a computer code from the memory to implement the above method. A computer-readable medium is also disclosed. The computer-readable medium includes instructions or a computer program, which, when executed by the wireless terminal, causes the wireless terminal to perform the above method.

[0006] Other aspects and alternatives of the above-described embodiments and their implementations are described in more detail in the following drawings, description and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A wireless communication network with an exemplary Over the Air (OTA) interface between a base station and a UE is shown.

[0008] Figure 2 An exemplary paging cycle with paging frames is shown.

[0009] Figure 3 The detailed structure of the paging frame and paging occasion is shown.

[0010] Figure 4 An exemplary paging cycle with SSB (synchronization signal / PBCH block) and paging occasions for the first type of paging downlink control information (DCI) is shown.

[0011] Figure 5 A paging mechanism using the second type of paging DCI is shown.

[0012] Figure 6 A paging mechanism using the third type of paging DCI is shown.

[0013] Figure 7 A paging mechanism using first and second types of paging DCI is shown.

[0014] Figure 8 A paging mechanism using the second and third types of paging DCIs is shown.

[0015] Fig. 9 Another paging mechanism using the second type of paging DCI is shown.

[0016] Fig.10 Another paging mechanism using the second and third types of paging DCIs is shown.

[0017] Fig.11 Another paging mechanism using first and second types of paging DCI is shown.

[0018] Fig.12 Another paging mechanism using first, second and third types of paging DCIs is shown. DETAILED DESCRIPTION

[0019] introduce

[0020] Figure 1A wireless communication network 100 is shown, which includes a core network 110 and a radio access network (RAN) 120. The RAN 120 also includes a plurality of base stations 122 and 124. The base station 122 and the user equipment (UE) 130 communicate with each other via an over-the-air (OTA) wireless communication resource 140. For example, the wireless communication network 100 may be implemented as a 2G, 3G, 4G / LTE or 5G cellular communication network. Accordingly, the base stations 122 and 124 may be implemented as a 2G base station, a 3G nodeB, an LTE eNB or a 5G New Radio (NR) gNB. The UE 130 may be implemented as a mobile or fixed communication device equipped with a SIM / USIM module for accessing the wireless communication network 100. The UE 130 may include, but is not limited to, a mobile phone, a laptop computer, a tablet computer, a personal digital assistant, a wearable device, a distributed remote sensor device, a roadside assistant device and a desktop computer. Alternatively, the RAN 120 may be implemented as other types of radio access networks, such as Wi-Fi, Bluetooth, ZigBee, and WiMax networks.

[0021] exist Figure 1 In the wireless communication system 100 of FIG. 1 , UE 130 may be connected to base station 122 via OTA interface 140. If there is an activated communication session associated with UE 130 and base station 122, the connection state between UE 130 and base station 122 is active, and UE is in active mode. On the other hand, if there is no activated communication session between UE 130 and base station 122, UE 130 moves to RRC idle state or RRC inactive state. UE 130 limits its use of radio resources during RRC idle state or RRC inactive state, and may reduce power consumption by using techniques including but not limited to discontinuous reception (DRX), as described in more detail below.

[0022] In DRX, resource monitoring and communication activities are managed in a periodic manner, which is called a DRX cycle. Figure 2 An exemplary embodiment of a DRX cycle including a plurality of radio frames is shown. In particular, in wireless communication systems such as LTE and 5G, radio signals are transmitted in radio frames. At the system level, radio frames are identified one by one, and each radio frame is numbered with a system frame number (SFN), which is recycled, for example, from 0 to 1023.

[0023] In DRX mode, the UE may enter sleep mode to reduce battery consumption. The UE periodically monitors paging occasions (PO). PO is a set of PDCCH monitoring occasions and may include multiple time slots (e.g., subframes or OFDM symbols) in which paging DCI may be sent. A paging frame (PF) includes a radio frame and may contain one or more POs or the starting point of a PO. Figure 2 and Figure 3 A more detailed description is given. The purpose of periodic monitoring on PO is to check whether there is a paging message for the UE and to obtain system information updates so that the UE can synchronize with the network. If there is no paging message for a particular UE, the UE can go back to sleep and wake up in the next cycle to monitor PO. This cycle is called a paging cycle or DRX cycle. The length of the paging cycle is given by the number of radio frames in each cycle, denoted as T.

[0024] Figure 3 An example paging frame structure 300 is shown. A paging frame 310 is a special radio frame that carries paging related information. The paging frame 310 may include multiple (e.g., 10) subframes 320 indexed from 0 to 9. Within the paging frame 310, there may be at least one PO 322 or a starting point for a PO. The PO 322 corresponds to one or more PDCCH monitoring opportunities, and each PDCCH monitoring opportunity may include one or more time slots in which a paging DCI may be sent. In an example wireless communication system, there may be at least one paging frame in a DRX cycle, and there may be at least one PO or a starting point for a PO in a paging frame. Multiple UEs may be assigned to monitor the same PO, with each UE monitoring one PO in the DRX cycle. The PF and PO for a particular UE may be determined using various system and UE parameters that are preconfigured or configured by higher layer signaling.

[0025] For example, the SFN number of the PF can be determined by solving the following equation:

[0026] (SFN+PF_offset)mod T=(T div N)*(UE_ID mod N)

[0027] In addition, the index (represented by i_s) for indicating the position of the PO in the PF can be determined by, for example, the following formula:

[0028] i_s=floor(UE_ID / N)mod Ns

[0029] The parameters used in these formulas are described below:

[0030] T: DRX cycle of the UE. T is determined by the shortest value of one or more UE-specific DRX values ​​(if UE-specific DRX values ​​are configured by RRC and / or upper layers) and the default DRX value broadcasted in the system information. In RRC_IDLE state, if UE-specific DRX is not configured by upper layers, the default value applies.

[0031] N: The total number of paging frames in T. N represents the density of paging frames in the DRX cycle.

[0032] Ns: The number of paging occasions of a PF. Ns represents the density of POs in a PF.

[0033] PF_offset: Offset used for PF determination.

[0034] UE_ID: 5G-S-TMSI mod 1024. This is a truncated UE ID by keeping the least significant bits in the ID space between 0 and 1023.

[0035] Monitoring of PO

[0036] In the PO detection process described above, there is at least one PO in the DRX cycle, and each PO is shared by multiple UEs. In particular, according to the above exemplary formula, the UEs in the network are assigned to different UE pools, and each UE pool is mapped to a PO. For example, assume that in a specific system, there are 2 POs in the DRX cycle. These two POs may or may not be in the same PF. Further assume that there are 200 UEs mapped to these two POs. These 200 UEs can fall into two pools, namely pool 1 and pool 2, each pool including, for example, 100 UEs. For example, the 100 UEs allocated in pool 1 are scheduled to monitor one of the two POs. In each DRX cycle, each of the 100 UEs in pool 1 monitors the corresponding PO to obtain the paging message indication of the paging DCI, and determines whether there is a paging message that needs further processing based on the paging message indication.

[0037] In some embodiments, the paging message indicates that a physical downlink shared channel (PDSCH) carrying the paging message may be scheduled. Such an indication may not be UE-specific, and the paging message may be targeted at one or more UEs. Thus, when the paging DCI indicates downlink scheduling of the paging message, even if not all UEs are paged, each UE in the pool needs to further decode the paging message according to the downlink scheduling, because the UE will not know whether it is paged before successfully decoding the paging message. The paging message may be targeted at only a few UEs in the UE pool. Thus, other non-target UEs still have to decode the paging message only in order to find that the paging message is directed to other UEs. This is called a false alarm for non-target UEs in the paging message. Therefore, this false alarm causes the non-target UE to waste energy to perform decoding. In extreme cases, if the paging message is only for 1 UE in the group, the remaining 99 unpaged UEs will still decode the paging message, which results in a high false alarm rate. Generally speaking, the more UEs allocated to the PO, the higher the false alarm rate.

[0038] In this case, the total power waste may be significant. Specifically, for a UE to be able to successfully decode a paging message in some cases, the UE may have to first detect multiple SSBs (synchronization signal / PBCH blocks) to adjust its AGC (Automatic Gain Control) and / or time / frequency synchronization for correctly decoding the paging DCI and the paging message. In the present disclosure, this decoding is referred to as deep decoding. Deep decoding can be more power intensive. This false alarm-induced deep decoding is very wasteful in terms of power consumption. Figure 4 The above PO detection and depth decoding process is shown. Figure 4 As shown, the UE pool monitors the PO 416 in each paging cycle 410. In order for the UE to correctly decode the paging DCI and the paging message 416, the UE needs to first detect one or more SSBs 412 and 414 before deep decoding to correctly decode the paging DCI and the paging message 416. However, in the end, the PO may or may not carry paging information for a specific UE.

[0039] In addition to the scheduling information of the paging message, the paging DCI can also carry system information update related information. If the UE only needs to obtain system information updates and does not need to decode the paging message, it can do so without detecting multiple SSBs. This process is called light decoding, which is less power intensive than deep decoding.

[0040] The various embodiments described below are designed to reduce the amount of false alarms of deep decoding caused by UEs in RRC idle state or RRC inactive state. At the same time, the opportunity for UEs to keep up with system information updates can be maintained.

[0041] Types of paging groups and paging DCIs

[0042] In order to reduce the amount of deep decoding caused by UE false alarms, a paging mechanism based on UE grouping and multiple types of different paging DCIs can be implemented. In particular, different types of paging DCIs can be designed. UEs in the same pool can also be divided into different groups associated with corresponding group IDs. The location of the PO can be determined based on at least one of the UE ID, group ID and / or paging DCI types. In general, the design of the paging DCI type and the grouping of UEs in the UE pool are implemented to reduce the false alarm rate and / or reduce the number of times the UE performs deep decoding. Each UE group can be configured to detect one or more types of paging DCI.

[0043] When only UE groups in a UE pool are associated with a PO instead of the entire UE pool, the grouping of UEs reduces the false alarm rate. For example, when the UE pool of 100 UEs described above is divided into four UE groups, each with 25 UEs, the false alarm rate of a specific UE will be reduced by 4 times.

[0044] In some embodiments, each UE may be associated with a group ID. UEs with the same group ID are grouped to monitor one or more POs containing one or more types of paging DCI. The group ID may be determined by high-layer signaling or system information, or may be determined by parsing the UE-ID or by parsing the UE's unique 5G-S-TMSI. As described above, the UE-ID represents a truncated mobile identifier in the form of, for example, 5G-S-TMSI mod 1024.

[0045] As shown in the following various embodiments, various types of DCI can be designed, where each type of DCI is associated with PO distributed in multiple DRX cycles in various ways and associated with different UE groups within the UE pool. Although three different types of DCI are shown below, a person of ordinary skill in the art can derive other types of DCI based on the disclosed embodiments without creative effort.

[0046] The first type of paging DCI targets UEs in one or more groups. In some embodiments, the first type of paging DCI may be associated with a PO in each DRX cycle. UEs in different groups may monitor the same PO associated with the first type of paging DCI in each DRX cycle. In some embodiments, the UE may only need to detect system information updates carried by the first type of paging DCI. The UE may not need to decode paging messages scheduled by the first type of paging DCI. In particular, by performing light decoding instead of deep decoding, the UE does not detect multiple SSBs before detecting the first type of paging DCI.

[0047] The second type of paging DCI targets UEs in a UE group. In some embodiments, the UE may need to monitor the second type of paging DCI for paging messages and system information updates. In some embodiments, the second type of DCI is associated with a PO in each DRX cycle. Each UE group monitors a PO every G DRX cycles, where G is a positive integer. In some embodiments, G is the number of UE groups. For example, if 100 UEs are divided into 4 groups, and G can be set to 4. Each UE in a particular group monitors the second type of paging DCI every 4 DRX cycles. Figure 5 This paging mechanism using the second type of paging DCI is shown. For example, UEs can be divided into 4 groups, namely group #0 to group #3. During paging cycle 520, the UEs in group #0 monitor PO 510 for the second type of paging DCI. Not shown in the figure, during the next two paging cycles, the UEs in group #1 and group #2 monitor PO for the second type of paging DCI. The group number rotates in each paging cycle. During paging cycle 522, the UEs in group #3 monitor PO 512 for the second type of paging DCI. Then, in paging cycle 524, the UEs in group #0 monitor PO 514 for the second type of paging DCI again. By using the second type of paging DCI, each UE may only need to detect the paging DCI for scheduling of paging messages every G cycles. Each UE may only need to perform deep decoding once every G DRX cycle instead of every DRX cycle.

[0048] For the third type of paging DCI, the paging DCI targets one or more UE groups. In some embodiments, the UE may need to monitor the third type of paging DCI for paging messages and / or system information updates. The PO associated with the third type of DCI occurs less frequently in multiple DRX cycles. UEs in one or more target groups can monitor the third type of paging DCI every G DRX cycles, where G is a positive integer. In some embodiments, G is the number of UE groups. For example, if 100 UEs are divided into 4 groups, and G can be set to 4. Each UE in these 4 groups monitors the third type of DCI every 4 DRX cycles. Figure 6 This paging mechanism using the third type of paging DCI is shown. For example, the third type of paging DCI may target four UE groups. Figure 6 As shown, during paging cycle 620, UEs in all four groups monitor the same PO 610 targeted by the third type of paging DCI, and then wait until paging cycle 622 to again monitor the PO 612 for the third type of paging DCI.

[0049] The number of DRX cycles that a UE monitors for a certain type of paging DCI is called the periodicity of the specific type of paging DCI. For example, if the UE monitors the first type of paging DCI every DRX cycle or every G1 DRX cycles, the periodicity of the first type of paging DCI is 1 or G1 DRX cycles, respectively. If the UE monitors the second type of paging DCI every G2 DRX cycles, the periodicity of the second type of paging DCI is G2 DRX cycles. Figure 5 As an example, the second type of paging DCI targets each of the four UE groups every four DRX cycles, so the period 530 for the second type of paging DCI is four DRX cycles. Similarly, if the UE monitors the third type of paging DCI every G3 DRX cycles, the period of the third type of paging DCI is G3 DRX cycles. The above G1, G2 and G3 are all positive integers. In some embodiments, G1, G2 or G3 may be the number of UE groups. In some other embodiments, G1, G2 or G3 may be a power of 2. In some other embodiments, G1, G2 and G3 may be the same. As shown below, the period for various types of paging DCI can be extended to M = (G + g), where M is a positive integer, G is the number of UE groups, and g is zero or a positive integer, which represents the amount of stretch of the DCI monitoring period over multiple groups. For example, for a specific type of DCI, the DCI for a specific UE may be associated with a PO every M DRX cycles.

[0050] A particular group of UEs may be configured to monitor a combination of different types of DCI. Example combinations are given below. Example methods for determining a PO corresponding to each UE group and for each type of paging DCI are also described below.

[0051] Example 1

[0052] In this embodiment, the UE is configured with a second type of paging DCI. Figure 5 An example is shown for a UE to detect only the second type of paging DCI. For a UE assigned in group #0, it monitors PO 510 during paging cycle 520. Then, it monitors PO 514 during paging cycle 524 in the next monitoring cycle. In this case, the number of UE groups is 4, and accordingly, the DCI monitoring cycle is 4 DRX cycles. Each UE group can receive paging DCI and paging messages (perform deep decoding) at corresponding DRX cycles within the monitoring cycle of 4 DRX cycles, and does not monitor any paging DCI during other DRX cycles within the monitoring cycle. Due to the reduction in the number of paging DCI and paging message detections, UE power consumption can be reduced. As described above, the monitoring cycle can extend to more than 4 cycles. For example, the monitoring cycle can extend to 5 cycles. In such an embodiment, one of the 5 DRX cycles in each monitoring cycle can correspond to no PO for any UE in the four UE groups.

[0053] Example 2

[0054] In this embodiment, the UE is configured with a first and a second type of paging DCI. The UE can detect the first type of paging DCI for system information updates every DRX cycle, but does not need to further receive scheduled PDSCH. In this case, the UE does not need to detect multiple SSBs before each PO associated with the first type of paging DCI, so light decoding is used and power consumption is reduced. At the same time, for paging DCI and paging messages, the UE can detect the PO associated with the second type of paging DCI every G DRX cycles (deep decoding). In this way, the UE is able to keep up with the system information updates in each DRX cycle in a timely manner using light decoding, while using deep decoding to detect the paging DCI of the paging message in each G DRX cycle.

[0055] Figure 7An example of using a combination of first and second types of paging DCI is shown. Again, assume that for the second type of DCI, there are four UE groups and a monitoring period of 4 DRX cycles. During paging cycle 740, the UEs in group #0 monitor the second type of paging DCI 712. The common PO 722 represents the PO associated with the first type of DCI and is common to more than one group of UEs, and the UEs in more than one group monitor the common PO 722. During the next paging cycle 742, the UEs in group #1 monitor the second type of paging DCI 714, and the UEs in more than one group monitor the common PO 724 associated with the first type of paging DCI. Similarly, in the next DRX cycle 744, the UEs in group #2 monitor the second type of paging DCI 716, and the UEs in more than one group monitor the common PO 726 associated with the first type of paging DCI. In addition, in the next DRX cycle 746, the UEs in group #3 monitor the second type of paging DCI 718, and the UEs in more than one group monitor the common PO 728 associated with the first type of paging DCI. Figure 7 As shown in 720 and 730 of , the monitoring process is repeated in the next cycle 748. Similarly, as described above, the monitoring cycle can be extended to more than 4 cycles. For example, the monitoring cycle can be extended to 5 cycles. In such an embodiment, one of the 5 DRX cycles in each monitoring cycle can correspond only to the common PO (corresponding to the first type of paging DCI).

[0056] Example 3

[0057] In this embodiment, the UE is configured with the second and third types of paging DCI. The UE may detect the second and third types of paging DCI every G DRX cycles. Figure 8An example for such an implementation is shown. During paging cycle 840, UEs in group #0 monitor paging DCI 812 of the second type. Public PO 822 represents a PO associated with paging DCI of the third type, and the paging DCI of the third type is targeted at one or more UE groups, so UEs in one or more groups monitor the public PO 822. During the next paging cycle 842, UEs in group #1 monitor paging DCI 814 of the second type, and there is no public PO corresponding to the third type of DCI. During the next paging cycle 844, UEs in group #2 monitor paging DCI 816 of the second type, and there is no public PO corresponding to the third type of paging DCI. Similarly, during the next paging cycle 846, UEs in group #3 monitor paging DCI 818 of the second type, and there is no public PO corresponding to the third type of paging DCI. The above process is repeated, and the next public PO 824 associated with the third type of paging DCI is scheduled in paging cycle 848.

[0058] exist Figure 8 In an example embodiment, each group performs deep decoding twice during a monitoring period of 4 DRX cycles. Group #0 UEs perform two depth decodings in paging cycle 840. Group #1 UEs perform deep decoding in DRX cycles 840 and 842. Group #2 UEs perform deep decoding in DRX cycles 840 and 844. Group #3 UEs perform deep decoding in DRX cycles 840 and 846. Again, as described above, the monitoring period can extend to more than 4 periods. For example, the monitoring period can extend to 5 periods. In this embodiment, one of the 5 DRX periods in the monitoring period may correspond only to the common PO corresponding to the third type of DCI.

[0059] Example 4

[0060] In this embodiment, the UE is configured with first and second types of paging DCI. The UE may detect the first and second types of paging DCI every G DRX cycles, where G may be set to the number of UE groups with or without stretching. The first type of paging DCI may only appear once every G DRX cycles.

[0061] Example 5

[0062] In this embodiment, the UE is configured with first, second and third types of paging DCI. The UE can detect the second and third types of paging DCI every G DRX cycles, where G is a positive integer. When the UE detects the second and third types of paging DCI, it performs deep decoding similar to the third embodiment described above. In addition, the UE can also detect the first type of paging DCI for system information update in each DRX cycle. When the UE detects the first type of paging DCI, it can perform light decoding without receiving the scheduled PDSCH and detect multiple SSBs before the first type of paging DCI.

[0063] Example 6

[0064] In this embodiment, if Figure 6 As shown in 600, the UE is configured with the third type of paging DCI. The UE can detect the third type of paging DCI every G DRX cycles. Since the UE wakes up once in multiple DRX cycles, power consumption can be reduced. Figure 6 An example of using the third type of paging DCI is shown. During paging cycle 620, the UEs in one or more groups monitor PO 610. During the next three DRX cycles, no UEs in the one or more groups are scheduled to monitor any paging DCI. Then, again during paging cycle 622, all UEs in the one or more groups monitor PO 612.

[0065] UE behaviors, requirements and capabilities

[0066] The UE may be configured to support various combinations of the three types of paging DCI. According to one aspect, the UE may be configured to detect one or more types of paging DCI in a plurality of paging DCI types. In addition, the UE may determine the timing of the paging frame and the PO that carries these paging DCIs targeted to the UE. The UE also requires frequency domain related information to locate and decode the paging DCI.

[0067] In some embodiments, the UE may support all or a combination of the three paging DCI types, or even partial features of a certain paging DCI type. The UE capabilities for supporting processing of various types of paging DCI may include, but are not limited to:

[0068] The type of paging DCI may be associated with UE capabilities or UE categories. For example, UE categories may include UEs with reduced capabilities or new wireless UEs.

[0069] • In some embodiments, the UE reports whether it supports the first or second or third type of paging DCI.

[0070] • In some embodiments, the UE with reduced capability supports the first or second or third type of paging DCI.

[0071] • In some embodiments, the UE reports the preferred type of paging DCI via UE assistance information.

[0072] • In some embodiments, the preferred configuration or parameters of the paging DCI may be conveyed by UE assistance information.

[0073] The UE may report such UE capability related parameters to the network by using a mechanism such as a UE capability message or a UE assistance information message. For example, the UE may report whether it supports the first, second or third type of paging DCI, or the UE may report whether it has reduced its ability to support the second or third type of paging DCI, or the UE may report its preferred type of paging DCI to the network. Such capability or preference information may be included in UE capability signaling or UE assistance information.

[0074] In some embodiments, the UE capability of supporting the second type or the third type of paging DCI is distinguished by frequency range. In some embodiments, the UE auxiliary information of the second type or the third type of paging DCI is distinguished by frequency range. The frequency range includes frequency range 1 (FR1) and frequency range 2 (FR2). For example, Table 1 gives the definition of frequency range.

[0075] Table 1: Definition of frequency range

[0076] Frequency range name Corresponding frequency range FR1 410MHz-7125MHz FR2 24250MHz-52600MHz

[0077] In some embodiments, the UE capability of supporting the second type or the third type of paging DCI is distinguished by time-division duplex (TDD) or frequency-division duplex (FDD).

[0078] In some specific embodiments, the UE determines the PO, detects the PDCCH at the PO, wherein at least one of three types of paging DCI is transmitted by the PDCCH: a first type of paging DCI, a second type of paging DCI, or a third type of paging DCI. Each type of paging DCI is associated with or determined by one or more predefined characteristics.

[0079] Predefined characteristics for various types of paging DCI

[0080] Each type of paging DCI is associated with or determined by one or more predefined characteristics. These predefined characteristics may include, but are not limited to, at least one of the following:

[0081] Time domain resource allocation for paging DCI.

[0082] Frequency domain resource allocation for paging DCI.

[0083] Information field (some information fields may be used to carry paging DCI type and / or UE group information).

[0084] Wireless network temporary identifier.

[0085] Search space set.

[0086] CORESET (control resource set).

[0087] UE capabilities.

[0088] UE category.

[0089] UE assistance information.

[0090] ·High-level signaling.

[0091] Relationship with reference signal.

[0092] These predefined features are described in more detail below.

[0093] Time domain determination of PO

[0094] In some embodiments, the predefined features include resource allocation in the time domain. The resource allocation in the time domain includes at least one of a paging frame, a paging occasion, or a first PDCCH monitoring occasion of a paging occasion. For example, for different types of paging DCIs, at least one of a paging frame, a paging occasion, or a first PDCCH monitoring occasion of a paging occasion may be different.

[0095] For example, the UE may determine the time domain resources for PF and PO. The following describes examples of time domain specifications for various types of DCI and PO for different UE groups.

[0096] For the network and UE to determine the location of the specific PO associated with each type of paging DCI and for a specific UE, the network and UE need to be able to determine the PF and PO locations in the time domain according to a common specification. The following subsections describe in more detail how these locations are determined.

[0097] Paging Frame (PF)

[0098] For the first type of paging DCI, the paging frame is associated with at least the UE-ID of each UE.Paging may not be associated with the UE group ID, as UEs in one or more groups monitor the first type of paging DCI.

[0099] For example, the SFN number for PF is determined by solving the following equation:

[0100] (SFN+PF_offset_1)mod T_1=(T_1 / N)*(UE_ID mod N),

[0101] Wherein, SFN is the system frame number, PF_offset_1 is the paging frame offset value, T_1 is the period of the first type of paging DCI, and N is the number of paging frames in the period. In some embodiments, T_1 represents the DRX period. UE_ID is a truncated UE identifier.

[0102] In some embodiments, the paging frame of the second or third type of paging DCI is determined by an offset relative to the paging frame of the first type of paging DCI. In some embodiments, the offset of the paging frame of the second or third type of paging DCI is different. In some embodiments, the offset range or candidate of the paging frame of the second or third type of paging DCI is different. In some embodiments, the offset is associated with at least one of a subcarrier spacing or a frequency range.

[0103] In some embodiments, for the second type of paging DCI, the paging frame is determined by at least one of the UE-ID, the group ID, or the number of groups. For example, the second type of paging frame is determined by at least the UE-ID and the group ID. For example, the second type of paging frame is determined by at least the UE-ID, the group ID, and the number of groups.

[0104] For example, the SFN number of the PF can be determined by solving the following equation:

[0105] (SFN+PF_offset_2)mod T_2=(T_2 / N / (G+g))*(UE_ID mod N)+(T_2 / G)*(GRP_ID+i);

[0106] or,

[0107] (SFN+PF_offset_2)mod T_2=(T_2 / N / (G+g))*(UE_ID mod N)+(T_2 / G / N)*(GRP_ID+i),

[0108] Where SFN is the system frame number, PF_offset_2 is the paging frame offset value, T_2 is the period of the second type of paging DCI, N is the number of paging frames in the period, GRP_ID is the group ID, i is an integer, and where M=G+g, and M is an integer. In particular, the number g represents a period stretched over the group number G. UE_ID is a truncated UE identifier. In some embodiments, T_2 is (G+g) times the DRX period.

[0109] The second formula for determining the above-mentioned paging frame offset for the second type of paging DCI is different from the first formula in that the PF for the second type of paging DCI is compressed into one or more DRX cycles instead of being extended over each DRX cycle during the monitoring period T_2, such as Fig. 9 In particular, Fig. 9 A paging mechanism for a second type of paging DCI is shown, whose period is equal to 4 DRX cycles. The example paging frames extended in all four DRX cycles for the second type of paging DCI determined by the first formula above are compressed into one DRX cycle 910 according to the second formula, as shown by paging frames PF 920, PF 922, PF 924, and PF 926. The UEs in the four UE groups monitor the corresponding PO in one of the paging frames PF 920, PF 922, PF 924, and PF 926 in the same DRX cycle 910. Fig. 9 As shown in the configuration, by adjusting the parameters in the second formula, such as N and G, the four PFs for the four UE groups can be distributed into two or three DRX cycles.

[0110] For the third type of paging DCI, the paging frame is determined by at least one of the UE-ID, the group ID, or the number of groups. For example, the third type of paging frame is determined by at least the UE-ID and the number of groups. For example, the third type of paging frame is determined by at least the UE-ID, the group ID, and the number of groups.

[0111] For example, the SFN number of the PF can be determined by solving the following equation:

[0112] (SFN+PF_offset_3)mod T_3=(T_3 / N / (G+g))*(UE_ID mod N)+(T_3 / G)*(GRP_ID_one+j);

[0113] or,

[0114] (SFN+PF_offset_3)mod T_3=(T_3 / N / (G+g))*(UE_ID mod N)+(T_3 / G)*(GRP_ID_one+j),

[0115] Where SFN is the system frame number, PF_offset_3 is the paging frame offset value, T_3 is the period of the third type of paging DCI, N is the number of paging frames in the period, where g and j are integers, and where GRP_ID_one is an integer. In some embodiments, GRP_ID_one is configured by high-layer signaling. UE_ID is a truncated UE identifier. In some embodiments, GRP_ID_one is one of the group IDs. In some embodiments, T3 is (G+g) times the DRX cycle.

[0116] In the case where the second type of paging DCI for all user groups is compressed into, for example, one or more DRX cycles, the above various embodiments including the second type of paging DCI will have different Figure 6 to Figure 7 The time domain configuration of Example 4 (a combination of the first type and the second type of paging DCI), Example 3 (a combination of the second type and the third type of paging DCI), and Example 5 (a combination of the first type, the second type, and the third type of paging DCI). Figures 10 to 12 The corresponding configuration of the second type of paging DCI is shown. Fig.10 As shown, during a DRX cycle 1010, UE groups 0-3 monitor PO for the third type of paging DCI at 1028, and the UEs in each group also monitor PO for the second type of paging DCI at 1020, 1022, 1024 and 1026, respectively. Fig.11 As shown, during one DRX cycle 1110, the UEs in groups 0-3 monitor the PO of the first type of paging DCI at 1128, and the UEs in each group additionally monitor the PO for the second type of paging DCI at 1120, 1122, 1124, and 1126, respectively. Fig.12 As shown, during one DRX cycle 1210, the UEs in groups 0-3 monitor the PO for the first type of paging DCI at 1230, and the UEs in each group additionally monitor the PO for the second type of paging DCI at 1220, 1122, 1124, and 1126, respectively. In the DRX cycle 1210, the UEs in each group also monitor the PO for the third type of paging DCI at 1228.

[0117] Paging timing determination

[0118] The paging occasion of the first, second or third type of paging DCI within the PF is associated with at least the UE-ID.

[0119] The index indicating the position of the PO within the PF (denoted by i_s_1) is determined by the following formula:

[0120] i_s_1=floor(UE_ID / N)mod Ns,

[0121] Where Ns is the number of POs targeted by the first or second or third type of paging DCI within the PF, N is the number of paging frames within the cycle, and UE_ID is a truncated UE identifier.

[0122] In some embodiments, the paging occasion of the second or third type of paging DCI is determined by an offset relative to the paging occasion of the first type of paging DCI. In some embodiments, the offset of the paging occasion of the second or third type of paging DCI is different. In some embodiments, the range or candidate of the offset of the paging occasion of the second or third type of paging DCI is different. In some embodiments, the offset is associated with at least one of a subcarrier spacing or a frequency range.

[0123] For example, the indexes (represented by (i_s_2) and (i_s_3)) used to indicate the position of the PO within the PF of the second and third types of paging DCIs may be determined by the following equations, respectively:

[0124] i_s_2 = floor(UE_ID / N) mod Ns + offset_2, and

[0125] i_s_3=floor(UE_ID / N)mod Ns+offset_3

[0126] The paging occasion of the second type of paging DCI is determined by at least the UE-ID and / or the group ID. For example, the offset value is determined by the UE-ID and / or the group ID.

[0127] First PDCCH monitoring opportunity of PO

[0128] In some embodiments, the first PDCCH monitoring timing of the PO of the first or second or third type of paging DCI may be determined by higher layer signaling.

[0129] In some embodiments, the first PDCCH monitoring timing of the PO of the second or third type of paging DCI is determined by an offset of the first PDCCH monitoring timing of the PO relative to the first type of paging DCI. In some embodiments, the offset of the first PDCCH monitoring timing of the PO of the second or third type of paging DCI is different. In some embodiments, the range or candidate of the offset of the first PDCCH monitoring timing of the PO of the second or third type of paging DCI is different. In some embodiments, the offset is associated with at least one of a subcarrier spacing or a frequency range.

[0130] In some embodiments, the first PDCCH monitoring occasion of the PO of the second or third type of paging DCI is determined by at least the UE-ID and / or the group ID.

[0131] Time Domain Resource Allocation

[0132] From the perspective of time domain resource allocation, the present disclosure discloses several different combinations for the first, second or third type of paging DCI, which are listed as follows:

[0133] • The resources of the third type of paging DCI may be shared with the resources of the first type of paging DCI.

[0134] The resource allocation in the time domain of the second or third type of paging DCI may be determined by an offset relative to the resource allocation in the time domain of the first type of paging DCI. In some embodiments, the offset of the resource allocation in the time domain of the second or third type of paging DCI is different. In some embodiments, the range or candidate of the offset of the resource allocation in the time domain of the second or third type of paging DCI is different. In some embodiments, the offset is associated with at least one of a subcarrier spacing or a frequency range.

[0135] • In some embodiments, the paging DCI of the second type with a different group ID is time division multiplexed (TDM). • In some embodiments, the paging DCI of the first type and the paging DCI of the second type are time division multiplexed (TDM).

[0136] • In some embodiments, the paging DCI of the second type and the paging DCI of the third type are time division multiplexed (TDM).

[0137] • In some embodiments, the paging DCI of the first type and the paging DCI of the third type are time division multiplexed (TDM).

[0138] In some embodiments, each type of paging DCI is associated with at least one of a period, a paging frame, a paging occasion, or the first PDCCH monitoring occasion of a PO. The periodic implementation of different types of paging DCI and the determination of a paging frame and a PO within a paging frame have been described in detail above. The determination of the first PDCCH monitoring occasion of a PO has also been described in detail above.

[0139] The time domain resource allocation for various types of paging DCIs, such as the second or third type of paging DCIs, may depend on the group ID of the UE. Various options for implementing the group ID have been described above.

[0140] Frequency Domain Resource Allocation

[0141] From the perspective of frequency domain resource allocation, the present disclosure discloses several different combinations of the first, second or third type of paging DCI, which are listed as follows:

[0142] • The resources of the third type of paging DCI may be shared with the resources of the first type of paging DCI.

[0143] • Resource allocation in the frequency domain of the first type of paging DCI may be determined by higher layer signaling.

[0144] The resource allocation in the frequency domain of the second or third type of paging DCI may be determined by an offset relative to the resource allocation in the frequency domain of the first type of paging DCI. In some embodiments, the offset of the resource allocation in the frequency domain of the second or third type of paging DCI is different. In some embodiments, the range or candidate of the offset of the resource allocation in the frequency domain of the second or third type of paging DCI is different. In some embodiments, the offset is associated with at least one of a subcarrier spacing or a frequency range.

[0145] • In some embodiments, the first type of paging DCI and the second type of paging DCI are frequency division multiplexed (FDM).

[0146] • In some embodiments, the second type of paging DCI and the third type of paging DCI are frequency division multiplexed (FDM).

[0147] • In some embodiments, the first type of paging DCI and the third type of paging DCI are frequency division multiplexed (FDM).

[0148] In some embodiments, the type of paging DCI is determined by, or is associated with, resource allocation in the time and frequency domains.

[0149] DCI Information Field

[0150] The above-mentioned various types of paging DCI carry various information fields. In some embodiments, the first type of paging DCI includes the following information fields:

[0151] Short message indicator.

[0152] Short messages.

[0153] Frequency domain resource allocation.

[0154] Time domain resource allocation.

[0155] VRB to PRB mapping.

[0156] Modulation and coding schemes.

[0157] TB scaling.

[0158] Reserved bits.

[0159] In some embodiments, the second type of paging DCI schedules a paging message for a UE group. The second type of paging DCI includes the following information fields:

[0160] Short message indicator.

[0161] Short messages.

[0162] Frequency domain resource allocation.

[0163] Time domain resource allocation.

[0164] VRB to PRB mapping.

[0165] Modulation and coding schemes.

[0166] TB scaling.

[0167] Additional information bits.

[0168] In some embodiments, the third type of paging DCI is a common paging DCI shared by multiple UE groups. The third type of paging DCI schedules paging messages for more than one group of UEs. The third type of paging DCI includes the following information fields:

[0169] Short message indicator.

[0170] Short messages.

[0171] Frequency domain resource allocation.

[0172] Time domain resource allocation.

[0173] VRB to PRB mapping.

[0174] Modulation and coding schemes.

[0175] TB scaling.

[0176] Additional information bits.

[0177] In some embodiments, the third type of paging DCI includes the first type of paging DCI, or the first type of paging DCI includes the third type of paging DCI.

[0178] In some embodiments, the first or second or third type of paging DCI includes an information field indicating an update of a reference signal configuration, wherein the reference signal includes at least one of a channel state information reference signal (CSI-RS) or a tracking reference signal (TRS). The TRS can be tracked by the CSI-RS.

[0179] In some embodiments, the type of the paging DCI is associated with or determined by interpretations or values ​​or code points of a plurality of information fields. The plurality of information fields include at least one of a short message or a predefined information field.

[0180] Information field used to carry paging DCI type indication and / or group ID: short message

[0181] The paging DCI carries information indicating its type among the three types of paging DCI. A paging DCI targeted at a specific group or groups of UEs carries group ID information for the group or groups of UEs. Such information may be carried by the various information fields of the paging DCI as described above in the manner detailed below.

[0182] In one embodiment, the paging DCI type indicator may be carried in a short message. The short message information field includes M bits, where M is a positive integer. In one embodiment, M=8. The type of the paging DCI is determined by a plurality of bits in the short message. For example, the plurality of bits include at least one of the 3rd to 8th bits of the short message.

[0183] For example, when multiple bits are set to a value of V1, it indicates a first type of paging DCI. In some embodiments, V1 may be all 0 or all 1. For another example, when multiple bits are set to a value of V2, it indicates a second type of paging DCI. For another example, when multiple bits are set to a value of V2, it indicates a second type of paging DCI. In some embodiments, for the second type of paging DCI, a group ID is transmitted. A bitmap may be used to indicate whether certain groups or subgroups are paged. For another example, when multiple bits are set to a value of V3, it indicates a third type of paging DCI. In some embodiments, the group ID is transmitted by a third type of paging DCI. A bitmap may be used to indicate whether certain groups are paged.

[0184] In another embodiment, the paging DCI type indicator may be carried in the code point of the short message. For example, when the code point of the short message is set to the value C1, it indicates the first type of paging DCI. In some embodiments, C1 may be all 0 or all 1. For another example, when the code point of the short message is set to the value C2, it indicates the second type of paging DCI. In some embodiments, the group ID or subgroup ID is indicated by the second type of paging DCI. The indication may be a bitmap. For another example, when the code point of the short message is set to the value C3, it indicates the third type of paging DCI. In some embodiments, the group ID is indicated by the third type of paging DCI. The indication may be a bitmap.

[0185] In another embodiment, the interpretation of the multiple bits of the short message is associated with the type of paging DCI. For example, the multiple bits can be reserved bits for the first type of paging DCI. For another example, the multiple bits are used as a bitmap to indicate whether the group or subgroup is paged for the second type of paging DCI. For another example, the multiple bits are used to indicate whether the groups are paged for the third type of paging DCI. The indication can also be a bitmap.

[0186] Information field used to carry paging DCI type indication and / or group ID: predefined information field

[0187] In another embodiment, the DCI also carries a predefined information field. The predefined information field includes an information field after the TB scaling information field. The predefined information field may include a reserved bit or an additional information bit. In some embodiments, the predefined information is a reserved bit in the first type of paging DCI. In some embodiments, the predefined information field is an additional information bit in the second or third type of paging DCI. In one embodiment, when the predefined information field is set to R1, it indicates the first type of paging DCI. In another embodiment, R1 may be all 0 or all 1. In another embodiment, when the predefined information field is set to R2, it indicates the second type of paging DCI. In some embodiments, the group ID or subgroup ID is transmitted by the second type of paging DCI. For example, multiple bits in the predefined information field are used as a bitmap to indicate whether the group or subgroup is paged for the second type of paging DCI. In another embodiment, when the predefined information field is set to R3, it indicates the third type of paging DCI. In some embodiments, the group ID is transmitted by the third type of paging DCI. The indicator may also be a bitmap.

[0188] In some cases, the interpretation of the multiple bits of the predefined information field is associated with the type of paging DCI. In some embodiments, the multiple bits are reserved bits for the first type of paging DCI. In some embodiments, the multiple bits are used to indicate whether a group or subgroup is paged for the second type of paging DCI. The indicator can also be a bitmap. In some embodiments, the multiple bits are used to indicate whether the groups are paged for the third type of paging DCI. The indicator can also be a bitmap.

[0189] In some embodiments, the type of paging DCI is determined by or associated with the resource allocation in the time domain and the interpretation or value of the information field. In some embodiments, the type of paging DCI is determined by or associated with the resource allocation in the frequency domain and the interpretation or value of the information field. In some embodiments, the type of paging DCI is determined by or associated with the resource allocation in the time domain and the frequency domain and the interpretation or value of the information field.

[0190] RNTI for various types of paging DCI

[0191] In some embodiments, the cyclic redundancy check (CRC) bits of the first type of paging DCI are scrambled by P-RNTI (Paging-Radio Network Temporary Identifier). In some embodiments, the CRC bits of the second or third type of paging DCI are scrambled by RNTI instead of P-RNTI.

[0192] In some embodiments, the RNTI value used to scramble the CRC bits of the first type of paging DCI is FFFE (hexadecimal number). In some embodiments, the value of the RNTI used to scramble the CRC bits of the second or third type of paging DCI is a value different from FFFE (hexadecimal number). For example, it may be in the range of FFF0-FFFD (hexadecimal number).

[0193] In some embodiments, the type of paging DCI is determined by or associated with the resource allocation in the time / frequency domain and the RNTI used to scramble the CRC bits of the paging DCI. In some embodiments, the type of paging DCI is determined by or associated with the information field of the CRC bits used to scramble the paging DCI and the interpretation / value of the RNTI.

[0194] High-level signaling or system information; search space set; CORESET; subcarrier spacing

[0195] In some embodiments, the type of paging DCI is determined by, or associated with, higher layer signaling or system information.

[0196] In some embodiments, the type of paging DCI is determined by or associated with resource allocation in the time / frequency domain and higher layer signaling. In some embodiments, the type of paging DCI is determined by or associated with RNTI and higher layer signaling.

[0197] In some embodiments, the type of paging DCI is associated with SCS (subcarrier spacing).In an example embodiment, the type of paging DCI depends on the subcarrier spacing.

[0198] In some embodiments, the type of paging DCI is associated with a search space set or a search space set ID. For example, at least one of the first or second or third paging DCI has a dedicated search space set or a search space set ID. For another example, a second type of paging DCI with a different group ID is distinguished by a search space set or a search space set ID.

[0199] In some embodiments, the type of paging DCI is associated with a CORESET (Control Resource Set) or a CORESET ID. For example, at least one of the first, second, or third type of paging DCI has a dedicated CORESET or CORESET ID. For another example, the second type of paging DCI with a different group ID is distinguished by a CORESET or CORESET ID.

[0200] UE Capabilities

[0201] The UE capabilities or categories or assistance information associated with processing various types of paging DCI have been described above in more detail.

[0202] DCI format

[0203] In some embodiments, the type of paging DCI may be associated with a DCI format. In some embodiments, the first type of paging DCI may be a DCI format 0-1. In some embodiments, the second or third type of paging DCI may be a DCI format different from DCI formats 0-1.

[0204] In some embodiments, the type of paging DCI is determined by, or is associated with, resource allocation in the time / frequency domain and the DCI format.

[0205] In some embodiments, the type of paging DCI is determined by, or is associated with, the RNTI and the DCI format.

[0206] In some embodiments, the type of paging DCI is determined by, or associated with, the RNTI and the search space set.

[0207] In some embodiments, the type of paging DCI is determined by, or associated with, the RNTI and the CORESET.

[0208] Relationship with reference signal

[0209] In some embodiments, the type of paging DCI is associated with an offset relative to a reference signal. In some embodiments, the offset of the first or second or third type of paging DCI is different. In some embodiments, the range or candidate of the offset of the first or second or third type of paging DCI is different. In some embodiments, the offset is associated with at least one of a subcarrier spacing or a frequency range.

[0210] In some embodiments, the type of paging DCI is associated with a period relative to a reference signal. For example, the period of the first type of paging DCI may be a multiple of the period of the reference signal, such as N1 times. For example, the period of the second type of paging DCI may be a multiple of the reference signal period, such as N2 times. For example, the period of the third type of paging DCI may be a multiple of the reference signal period, such as N3 times. Wherein N1, N2 and N3 are positive integers. In some embodiments, the reference signal is at least one of SSB, CSI-RS (channel state information reference signal), TRS (tracking reference signal).

[0211] Detailed description of Example 1

[0212] Exemplary embodiments of a paging scheduling and control mechanism based on the second type of paging DCI are described in detail.

[0213] The UE is configured to support at least the second type of paging DCI. Figure 5 As an example. There are 4 UE groups and a specific UE is assigned to group #0. The UE is configured to detect the second type of paging DCI every 4 paging cycles (paging cycle is also called DRX cycle). In this specific embodiment, the period of the second type of paging DCI is 4 DRX cycles, which is shown as cycle 530. During paging cycle 520, the UE wakes up and detects PO, and further decodes the paging DCI of the PDCCH channel from the PO. Based on the information carried in the DCI, the UE can take further actions, such as locating and decoding the paging message from the PDSCH channel.

[0214] The second type of paging DCI schedules paging messages for UE groups. For example, paging messages for group #0 UEs are scheduled at paging cycle 520, while paging messages for group #3 UEs are scheduled at paging cycle 522.

[0215] The second type of paging DCI includes the following information fields:

[0216] Short message indicator.

[0217] Short messages.

[0218] Frequency domain resource allocation.

[0219] Time domain resource allocation.

[0220] VRB to PRB mapping.

[0221] Modulation and coding schemes.

[0222] TB scaling.

[0223] In some cases, the type of the paging DCI is determined by a short message of multiple bits, wherein the multiple bits include at least one of the 3rd to 8th bits of the short message.

[0224] In some cases, the type of paging DCI is determined by the code point of the short message.

[0225] In some cases, the type of paging DCI is determined by a predefined information field.In some cases, the second type of paging DCI conveys the group ID being paged.

[0226] In some cases, a second type of paging DCI with a different group ID is time division multiplexed (TDM)

[0227] In some cases, the UE detects the second type of paging DCI every G2 DRX cycles, or the paging occasion period of the second type of paging DCI is G2 DRX cycles. In some cases, G2 can be the number of groups. For example, Figure 5 As shown, there are four paging groups and the period is 4 DRX cycles. In some cases, G2 can be a power of 2.

[0228] In some cases, the paging frame of the second type of paging DCI is determined by at least the UE-ID, the group ID, and the number of groups.

[0229] For example, the SFN number used for the paging frame (represented by PF_offset_2) is determined by solving the following equation: (SFN+PF_offset_2) mod T_2 = (T_2 / N / G)*(UE_ID mod N)+(T_2 / G)*GRP_ID;

[0230] or,

[0231] (SFN+PF_offset_2)mod T_2=(T_2 / N / G)*(UE_ID mod N)+(T_2 / G / N)*GRP_ID; wherein SFN is the system frame number, PF_offset_2 is the offset value, T_2 is the period of the second type of paging DCI, N is the number of paging frames in the period, G is the number of groups, and GRP_ID is the group ID.

[0232] In some cases, the group ID is determined by higher layer signaling or system information. In some cases, the group ID is determined by UE-ID or 5G-S-TMSI.

[0233] In some cases, T2 is G times the DRX cycle.

[0234] The index indicating the position of the PO within the PF (denoted by (i_s_2)) is determined by the following formula:

[0235] i_s_2=floor(UE_ID / N)mod Ns+offset_2

[0236] Wherein, Ns is the number of POs of the first type of paging DCI within the PF, wherein offset_2 is an offset value and offset_2 is an integer.

[0237] In some cases, resources of the second type of DCI are shared with resources of the first type of DCI.

[0238] In some cases, the resource allocations of the second type of DCI are frequency division multiplexed (FDM) or time division multiplexed (FDM) with the resource allocations of the first type of DCI.

[0239] In some cases, the second or third type of paging DCI is scrambled by the RNTI instead of the P-RNTI.

[0240] In some cases, the RNTI value used to scramble the second type of paging DCI is not FFFE (hexadecimal number). For example, the value is in the range of FFF0-FFFD (hexadecimal number).

[0241] In some cases, the UE reports whether it supports the second type of paging DCI.

[0242] In some cases, the UE is configured with reduced capability to support the second type of paging DCI.

[0243] In some cases, the preferred configuration or parameters of the second type of paging DCI may be conveyed by UE assistance information.

[0244] Details of other embodiments (such as embodiments 2-6) can be derived in a manner similar to the first embodiment described above.

[0245] In summary, the above disclosure describes a method and system for UE monitoring paging DCI. Paging DCI includes several different types. UE is divided into multiple groups. Each UE group can monitor any combination of several types of paging DCI. The type of paging DCI is determined by a predefined feature. The paging frame and paging occasion associated with each type of paging DCI for a specific UE can be determined based on a UE identifier. The scheme described in the present disclosure helps to reduce the false alarm rate in paging monitoring, thereby reducing the UE power consumption of the UE, especially the UE in the RRC idle state or the RRC inactive state.

[0246] The various embodiments below are designed to reduce the amount of false alarms caused by deep decoding of UEs in an idle state, while maintaining ample opportunities for the UE to keep up with system update information.

[0247] The above description and accompanying drawings provide specific example embodiments and implementations. However, the described subject matter can be embodied in a variety of different forms, and therefore, the subject matter covered or claimed is intended to be interpreted as not limited to any example embodiment set forth herein. It is intended to be directed to a reasonably broad scope of the subject matter claimed or covered. Among other aspects, for example, the subject matter can be embodied as a method, device, component, system or non-transitory computer-readable medium for storing computer code. Therefore, the embodiment can, for example, take the form of hardware, software, firmware, storage medium or any combination thereof. For example, the method embodiment described above can be implemented by a component, device or system including a memory and a processor by executing a computer code stored in the memory.

[0248] Throughout the specification and claims, in addition to the meanings explicitly stated, terms may have subtle meanings that are suggested or implied by the context. Likewise, the phrase "in one embodiment / implementation" as used herein does not necessarily refer to the same embodiment, and the phrase "in another embodiment / implementation" as used herein does not necessarily refer to a different embodiment. For example, it is intended that the claimed subject matter includes all or part of the combination of the example embodiments.

[0249] In general, terms can be understood at least in part from the usage in the context. For example, terms such as "and", "or", "and / or", as used herein, can include various meanings, which can depend at least in part on the context in which these terms are used. Typically, if "or" is used to associate a list such as A, B, or C, it is intended to mean A, B, and C used in an inclusive sense here, and A, B, or C used in an exclusive sense here. In addition, the term "one or more" as used herein, at least in part depending on the context, can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense. Similarly, terms such as "one", "an", or "the" can be understood to convey singular usage or convey plural usage depending at least in part on the context. In addition, the term "based on" can be understood to not necessarily be intended to convey an exclusive set of factors, but can also depend at least in part on the context to allow the presence of additional factors that are not necessarily explicitly described.

[0250] Throughout the specification, references to features, advantages, or similar language do not imply that all features and advantages that may be achieved with the present solution should or are included in any single embodiment thereof. Rather, language referring to features and advantages is understood to mean that a specific feature, advantage, or characteristic described in connection with an embodiment is included in at least one embodiment of the present solution. Thus, throughout the specification, discussion of features and advantages and similar language may, but do not necessarily, refer to the same embodiment.

[0251] In addition, the described features, advantages, and characteristics of the present solution may be combined in any suitable manner in one or more embodiments. One of ordinary skill in the relevant art will recognize that, based on the description herein, the present solution may be practiced without one or more specific features or advantages of a particular embodiment. In other cases, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments of the present solution.

Claims

1. A method performed by a wireless terminal in a wireless network node, comprising: Determine one or more paging occasions (PO) within a predetermined duration, each paging occasion being for one type of paging DCI among one or more types of paging DCI, wherein the paging occasion of at least one type of paging DCI among the one or more types of paging DCI is based at least on a truncated identifier of the wireless terminal and a group identifier of the wireless terminal; and monitoring a physical downlink control channel (PDCCH) at the one or more POs for a predetermined duration, The one or more types of paging DCI include at least one of a first type of paging DCI, a second type of paging DCI, or a third type of paging DCI. The wireless terminal monitors the first type of paging DCI every DRX cycle, monitors the second type of paging DCI every G2 DRX cycles, and monitors the third type of paging DCI every G3 DRX cycles, G2 and G3 are positive integers greater than or equal to the number of wireless terminal groups or are powers of 2, and Therein, the wireless terminal does not need to decode the paging message scheduled by the first type of paging DCI.

2. The method according to claim 1, wherein: Each of the first type of paging DCI, the second type of paging DCI, or the third type of paging DCI is associated with or determined by a predefined characteristic.

3. The method according to claim 2, wherein: The first type of paging DCI, the second type of paging DCI, or the third type of paging DCI includes at least one information field selected from the following: Short message indicator; One or more short messages; Frequency domain resource allocation; Time domain resource allocation; Mapping between virtual resource blocks and physical resource blocks; Modulation and coding schemes; Transport block scaling; or Additional information bits.

4. The method according to claim 1, wherein: The first type of paging DCI or the third type of paging DCI includes information of one or more wireless terminal groups.

5. The method according to claim 4, wherein: The one or more groups of wireless terminals are identified by a set of group identifiers.

6. The method according to claim 1, wherein: The second type of paging DCI includes information of a wireless terminal group.

7. The method according to claim 6, wherein: The one wireless terminal group is identified by the group identifier.

8. The method according to claim 3, wherein: The predefined characteristics include at least one of the following: one or more information fields of the at least one information field; Resource allocation in the frequency domain; Resource allocation in the time domain; Radio Network Temporary Identifier (RNTI) Search space set; Control resource sets; Wireless terminal capabilities or wireless terminal categories; Wireless terminal assistance information; Higher layer signalling; or Relationship with the reference signal.

9. The method according to claim 8, wherein: The predefined characteristics include one or more information fields of the at least one information field.

10. The method according to claim 9, wherein: One or more of the at least one information field of the paging DCI includes a type indicator indicating a type of the paging DCI in at least one of the first type, the second type, or the third type.

11. The method according to claim 9, wherein: One or more of the at least one information field of the paging DCI comprises at least one group indicator for indicating at least one wireless terminal group, or at least one sub-group indicator for indicating at least one wireless terminal sub-group.

12. The method according to claim 8, wherein: One or more information fields of the at least one information field include one or more bits of the one or more short messages or the additional information bits.

13. The method according to claim 8, wherein: The predefined characteristics include resource allocation in the time domain.

14. The method according to claim 13, wherein: The resource allocation in the time domain is associated with a predetermined duration of the paging DCI.

15. The method of claim 13, wherein: The predetermined duration includes M discontinuous reception (DRX) cycles; and M is a first predetermined positive integer.

16. The method according to claim 15, further comprising: The paging DCI of the first type is monitored in each DRX cycle within the predetermined duration.

17. The method according to claim 15, further comprising: The second type of paging DCI or the third type of paging DCI is monitored every M DRX cycles, where M is not less than the number of wireless terminal groups. The method according to claim 15 , the resource allocation in the time domain comprises a time position of the one or more POs.

19. The method according to claim 18, wherein: Determining the one or more POs comprises: determining a paging frame corresponding to the one or more POs; and Determine the indexes of the one or more POs in the paging frame.

20. The method according to claim 19, wherein: Determining a paging frame for the second type of paging DCI or the third type of paging DCI is based on at least one of a truncated identifier of the wireless terminal, a group identifier of the wireless terminal, or M.

21. The method according to claim 20, wherein: Determining the paging frame for the second type of paging DCI is based on at least one of the following formulas: (SFN+PF_offset2)mod T2=(T2 / N / M)*(UE_ID mod N)+(T2 / M)*(GRP_ID+i); or (SFN+PF_offset2)mod T2=(T2 / N / M)*(UE_ID mod N)+(T2 / M / N)*(GRP_ID+i), Wherein, SFN is the system frame number, PF_offset2 is the offset value of the paging frame, T2 is the predetermined duration of the second type of paging DCI, N is the number of paging frames within T2, and GRP_ID is the group identifier of the wireless terminal, and i is a non-negative integer.

22. The method according to claim 20, wherein: Determining the paging frame for the third type of paging DCI is based on at least one of the following formulas: (SFN+PF_offset3)mod T3=(T3 / N / M)*(UE_ID mod N)+(T3 / M)*(GRP_one+i); or, (SFN+PF_offset)mod T3=(T3 / N / M)*(UE_ID mod N)+(T3 / M / N)*(GRP_one+i), Wherein, SFN is the system frame number, PF_offset3 is the offset value of the paging frame, T3 is the predetermined duration of the third type of paging DCI, N is the number of paging frames in T3, and GRP_one, i is a non-negative integer.

23. The method according to claim 19, wherein: Determining an index of one of the one or more POs within a paging frame for the first type of paging DCI, the second type of paging DCI, or the third type of paging DCI is based on: index=floor(UE_ID / N)mod Ns+offset, Wherein, Ns is the number of POs of the first type of paging DCI or the second type of paging DCI or the third type of paging DCI within a paging frame, and wherein offset is an integer offset value.

24. The method according to claim 19, wherein: Determining an index of one of the one or more POs within a paging frame for the second type of paging DCI or the third type of paging DCI is based on an offset relative to an index of a PO within a paging frame for the first type of paging DCI.

25. The method according to claim 20, wherein: The group identifier of the wireless terminal is provided by higher layer signaling, system information or by a bit set of the mobile identifier of the wireless terminal.

26. The method according to claim 8, wherein: Resource allocation of the second type of paging DCI or the third type of paging DCI is multiplexed with resource allocation of the first type of paging DCI in the frequency domain or the time domain.

27. The method according to claim 8, wherein: The resource allocation of the third type of paging DCI is shared with the resource allocation of the first type of paging DCI in the frequency domain or the time domain.

28. The method according to claim 8, wherein: The predefined characteristics include the Radio Network Temporary Identifier (RNTI).

29. The method according to claim 28, wherein: Cyclic redundancy check (CRC) bits of the first type of paging DCI are scrambled by the P-RNTI, and CRC bits of the second type of paging DCI or the third type of paging DCI are scrambled by an RNTI different from the P-RNTI.

30. The method of claim 28, wherein: The value of the RNTI used to scramble the CRC bits of the first type of paging DCI message is a hexadecimal number FFFE.

31. The method of claim 28, wherein: The value of the RNTI used to scramble the CRC bits of the second type of paging DCI or the third type of paging DCI is not a hexadecimal number FFFE.

32. The method of claim 8, further comprising: The wireless terminal reports that the wireless terminal supports the second type of paging DCI or the third type of paging DCI.

33. The method of claim 8, wherein: Configuration or parameters of the first type of paging DCI, the second type of paging DCI or the third type of paging DCI are transmitted in the assistance information of the wireless terminal.

34. The method of claim 8, wherein: The relationship to the reference signal comprises an offset relative to the reference signal.

35. The method of claim 34, wherein: The reference signal is at least one of a synchronization signal / PBCH block SSB or a channel state information reference signal CSI-RS.

36. A wireless terminal according to any one of claims 1 to 35, comprising a processor and a memory, wherein: The processor is configured to read computer code from the memory to implement the method according to any one of claims 1 to 35.

37. A computer program product comprising a non-transitory computer readable program medium having computer code stored thereon, which, when executed by a processor, causes the processor to implement the method according to any one of claims 1 to 35.

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